WO2013080411A1 - 回線中継装置、tdm回線迂回システムおよびtdm回線迂回制御方法 - Google Patents
回線中継装置、tdm回線迂回システムおよびtdm回線迂回制御方法 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/12—Avoiding congestion; Recovering from congestion
- H04L47/122—Avoiding congestion; Recovering from congestion by diverting traffic away from congested entities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/08—Intermediate station arrangements, e.g. for branching, for tapping-off
- H04J3/085—Intermediate station arrangements, e.g. for branching, for tapping-off for ring networks, e.g. SDH/SONET rings, self-healing rings, meashed SDH/SONET networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
- H04L12/427—Loop networks with decentralised control
- H04L12/43—Loop networks with decentralised control with synchronous transmission, e.g. time division multiplex [TDM], slotted rings
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0896—Bandwidth or capacity management, i.e. automatically increasing or decreasing capacities
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- H—ELECTRICITY
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- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0028—Local loop
- H04J2203/003—Medium of transmission, e.g. fibre, cable, radio
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- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0051—Network Node Interface, e.g. tandem connections, transit switching
- H04J2203/0053—Routing
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- H—ELECTRICITY
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- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
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- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1682—Allocation of channels according to the instantaneous demands of the users, e.g. concentrated multiplexers, statistical multiplexers
Definitions
- the present invention relates to a line repeater, a TDM line detour system, and a TDM line detour control method, and more particularly, in the field of a line repeater such as an outdoor transmission apparatus (wireless repeater) in a ring configuration network, depending on the surrounding environment. It can be suitably applied to a line repeater that accommodates transmission lines with varying transmission bandwidths, makes it possible to bypass TDM (Time Division Multiplexing) line data, and even if the transmission bandwidth varies, the data Can be transmitted without being discarded.
- TDM Time Division Multiplexing
- the transmission rate that can be transmitted varies under the influence of the surrounding environment.
- the network designer determines the transmission rate according to the transmission rate initially designed for network setting. Assuming the throughput to be transmitted, TDM (Time Division Multiplexing) lines and Ethernet (registered trademark) lines are accommodated. Therefore, when the transmission rate does not vary, it is possible to transmit at the throughput assumed by the network designer.
- the throughput of the accommodated TDM line and Ethernet line should be transmitted at the current transmission speed of the transmission speed fluctuation type inter-device line. It is assumed that it will not be possible to provide an appropriate service.
- the network topology is the Ring configuration
- the other path Is connected to the destination by the Ring configuration it is possible to transmit through the path of the detour route using the other route.
- the transmission rate of the transmission rate fluctuation type inter-device line connected to the line relay device fluctuates due to the influence of the surrounding environment, the transmission rate fluctuation range exceeds the transmission band required for the TDM line.
- the data on the TDM line cannot be transmitted, and the data is discarded without outputting the data on the TDM line from the line between the transmission speed fluctuation type devices. There is a problem.
- the transmission speed variation type inter-device line speed fluctuation may occur, and the TDM flowing into the line relay apparatus may occur.
- the line data only TDM line data that can be transmitted in the changed transmission band can be transmitted. For this reason, even when the wireless modulation scheme is changed, there is a problem that data on the TDM line overflowing from the transmission band is not transmitted to the opposite device side.
- FIG. 4 is a network configuration diagram showing a configuration example of a network in which transmission rate fluctuation type inter-device lines are connected in a ring shape.
- an explanatory diagram for explaining a conventional data transmission method of a TDM line in a ring network It is used as.
- the ring relay apparatus 1, 2 and 3 are connected in a ring-like manner by transmission rate variation type inter-device lines 11, 12 and 13, which are composed of lines such as a radio line whose transmission rate varies.
- 2 shows a configuration example of a Ring network connected to the network.
- a TDM line is accommodated between the TDM terminating device 21 and the line relay device 1, and an Ethernet line is accommodated between the L2 switch 31 and the line relay device 1.
- the line relay apparatuses 1, 2, and 3 have a Ring configuration by the transmission speed fluctuation type inter-apparatus lines 11, 12, and 13 as described above.
- the STP protocol (Spanning Tree Protocol: Spanning Tree Protocol) is used.
- the connection of the variable inter-device line 13 is set to a logically disconnected state.
- TDM communication includes, as uniquely determined transmission paths, for example, a TDM termination device 21 connected using a TDM line, a line relay device 1 that terminates a TDM line, a line relay device 1, and a line relay device 3. Communication is performed via a transmission speed variation type inter-device line 11 (bandwidth variation type line) to be connected, a line relay device 3 that terminates the TDM line, and a TDM termination device 22 that is connected using the TDM line.
- a transmission speed variation type inter-device line 11 bandwidth variation type line
- the communication on the Ethernet line includes the L2 switch 31 connected using the Ethernet line, the line relay device 1 that terminates the Ethernet line, and the transmission speed fluctuation type inter-device line that connects the line relay device 1 and the line relay device 3. 11. Communication is performed via the line relay device 3 that terminates the Ethernet line and the L2 switch 33 that is connected using the Ethernet line.
- the line relay apparatus 2 communicates with the L2 switch 32 connected using the Ethernet line, and is connected to the other apparatuses via the transmission speed variation type inter-apparatus lines 12 and 13 connected to the line relay apparatuses 1 and 3. Ethernet communication is performed.
- the transmission rate fluctuation type inter-device line 13 is logically disconnected by the spanning tree protocol STP protocol in normal times. That is, for data for Ethernet communication transmitted from the line relay device 2 to the line relay device 3, detour paths such as the transmission speed fluctuation type inter-apparatus line 12, the line relay apparatus 1, and the transmission speed fluctuation type inter-apparatus line 11 are used. Then, the data is transmitted to the line relay device 3.
- the line relay device 1 transmits only the data for the TDM line corresponding to the transmittable band to the line relay device 3.
- the TDM line data overflowing from the transmittable band is discarded in the line relay apparatus 1 without being transmitted from the line relay apparatus 1 to the line relay apparatus 3. For this reason, there is a problem that data to be originally transmitted is not transmitted from the line relay device 1 due to the fluctuation of the transmission band.
- the present invention has been made in view of such a problem, and there is a possibility that a detour path of a TDM line is formed and discarded in accordance with a change in transmission speed by utilizing the Ring configuration. It is an object of the present invention to provide a line relay device, a TDM line bypass system, and a TDM line bypass control method that realizes a redundant service for TDM line data.
- the line repeater, the TDM line bypass system, and the TDM line bypass control method according to the present invention mainly adopt the following characteristic configuration.
- a line repeater is a line repeater that relays and transmits data of a communication line, and is connected in a ring shape with a transmission rate variation type inter-device line that varies in transmission rate between opposite devices.
- the transmission rate of the transmission rate fluctuation type inter-device line previously set as the transfer path of the TDM line has fluctuated and the transmittable transmission band is reduced.
- the transmission bandwidth of the TDM line overflowing from the transmission rate fluctuation type inter-device line is detoured and transferred via another line relay device connected in a ring shape. A detour path of the TDM line is formed.
- the TDM line bypass system uses a ring network having a configuration in which line relay apparatuses that relay and transmit data of communication lines are connected in a ring shape by a transmission speed fluctuation type inter-apparatus line whose transmission speed varies.
- each line relay apparatus is configured by at least the line relay apparatus described in (1).
- a TDM line detour control method includes a ring network having a configuration in which line relay apparatuses that relay and transmit data of communication lines are connected in a ring shape by a transmission speed variation type inter-apparatus line whose transmission speed varies. And a TDM line bypass control method that enables setting or canceling a bypass path of a TDM line, and any one of the line relay devices is set in advance as a transfer path of the TDM line
- the transmission rate fluctuation type inter-device line is changed according to the fluctuation range of the transmission rate.
- a detour route of the TDM line is formed in which the transmission band of the overflowing TDM line is detoured via another line relay device connected in a ring shape.
- the first effect is that when the transmission band of the transmission speed fluctuation type inter-apparatus line connecting between the line relay apparatuses fluctuates, a detour path corresponding to the transmission band of the overflowing TDM line is automatically used by using the Ring configuration. Therefore, it is possible to reliably prevent data on the TDM line from being discarded and to provide a redundant service for the TDM transmission band.
- the second effect is that after automatically forming a detour path for the transmission band of the overflowing TDM line, following the change in the transmission band of the line between the transmission speed fluctuation type apparatuses connecting the line relay apparatuses.
- the transmission bandwidth of the transmission speed variation type device line returns to the original state, the data transfer path of the TDM line is automatically restored to the original state. It is not necessary to optimize the network settings every time the transmission speed of the interline line is changed.
- FIG. 5 is a block configuration diagram showing a block configuration of a line relay device 2 in the network of FIG. 4.
- FIG. 5 is a block configuration diagram showing a block configuration of a line relay device 3 in the network of FIG. 4.
- a path through which the TDM data before the transmission bandwidth of the transmission speed fluctuation type inter-apparatus line (transmission speed fluctuation type inter-apparatus line 11) set in advance as a data transfer path of the TDM line decreases is transferred. It is explanatory drawing for demonstrating.
- FIG. 5 is a flowchart for explaining an operation flow on the side of a detour path request destination apparatus (line relay apparatus 2) at the time of detour control related to a TDM line in the network shown in FIG. 5 is a flowchart for explaining an operation flow on the side of a detour path request destination apparatus (line relay apparatus 2) at the time of detour recovery control related to a TDM line in the network illustrated in FIG. 5 is a flowchart for explaining an operation flow on the side of a detour route request final destination device (line relay device 3) at the time of detour control related to a TDM line in the network shown in FIG. 5 is a flowchart for explaining an operation flow on a detour path request final destination apparatus (line relay apparatus 3) side during detour recovery control for a TDM line in the network illustrated in FIG.
- a line relay device a TDM line bypass system, a TDM line bypass control method, and a TDM line bypass control program according to the present invention will be described with reference to the accompanying drawings.
- the TDM line bypass control method can be executed by a computer mounted on the line relay device.
- the program may be implemented as a bypass control program, or may be recorded on a computer-readable recording medium.
- the line relay apparatuses constituting the network are premised on a configuration in which the transmission speed varies depending on the surrounding environment or the like, and the transmission speed fluctuation type inter-apparatus line is connected to each other.
- the inter-type device line may be configured by any line regardless of wired or wireless.
- the present invention relates to a transmission rate fluctuation type inter-device line in a Ring network (ring network) connected in a ring shape by a transmission rate fluctuation type inter-device line in which the transmission speed fluctuates depending on the surrounding environment or the like.
- ring network Ring network
- TDM Time Division Multiplexing
- the line relay apparatus 1 that accommodates the transmission speed variation type inter-apparatus lines 11 and 12 includes data from the TDM line that is terminated. Route selection information as to which of the transmission rate fluctuation type inter-device lines 11 and 12 is to be transmitted with data from the Ethernet line is held in advance.
- the transmission speed of the line previously selected as the TDM line data transmission line for example, the transmission speed fluctuation type inter-apparatus line 11 fluctuates, and the transmittable band is greater than the current TDM line accommodation band. If it is lower than the value, the data of the TDM line overflowing from the transmission band of the transmission speed fluctuation type inter-apparatus line 11 whose transmission speed is reduced is transferred to the transmission speed fluctuation type.
- a detour path is constructed for detouring to the inter-device line 12, the line relay device 2, and the transmission rate fluctuation type inter-device line 13.
- FIG. 1 is a block configuration diagram showing an example of a block configuration of a line repeater according to the present invention.
- line repeaters 1, 2, and 3 constituting the ring-shaped network shown in FIG. Both of these are assumed to be configured by a line relay device as shown in FIG.
- TDM line termination unit 101 includes a TDM line termination unit 101, an Ethernet line termination unit 102, a device specific information storage unit 103, an STP processing unit 104, a MUX / DEMUX 105 (: Multiplexer / Demultiplexer), and an inter-device line aggregation / distribution.
- Unit 106 distribution mapping unit 107, mapping request processing unit 108, and inter-device line termination units 109 and 110.
- Inter-device line terminators 109 and 110 are portions for terminating transmission rate variation type inter-device lines 11 and 12 forming a ring-shaped network in the line relay device 1 shown in FIG.
- the MUX / DEMUX 105 converts the TDM data received by the TDM line terminating unit 101 and the Ethernet frame received by the Ethernet line terminating unit 102 into a format that can be transmitted on the transmission rate variable inter-device lines 11 and 12. Data transmission is performed between the opposite devices connected to the transmission speed fluctuation type inter-device lines 11, 12, that is, the line relay devices 3, 2. Also, TDM data and an Ethernet frame are respectively extracted from the transmission formats received on the transmission rate variation type inter-device lines 11 and 12, and the TDM data is sent to the TDM line terminator 101 and the Ethernet line terminator 102 is sent. The Ethernet frame is transmitted via the STP processing unit 104.
- the inter-apparatus line aggregation / distribution unit 106 performs aggregation and distribution of data of the two inter-apparatus line termination units 109 and 110, and according to the mapping memory information set in the distribution mapping unit 107, any route To determine whether to transmit data.
- the inter-device line termination units 109 and 110 hold / compare the current transmission rate information of the transmission rate fluctuation type inter-device line 11 and the transmission rate fluctuation type inter-device line 12, respectively. When there is a difference between the current transmission rate and the previous transmission rate, it is determined that the transmission rate has changed. When it is determined that the transmission rate has fluctuated, the current transmission rate information after the fluctuation is notified to the distribution mapping unit 107, the distribution mapping unit 107 performs appropriate mapping settings, and updates the mapping memory.
- the mapping request processing unit 108 stores information on the mapping memory set in the current distribution mapping unit 107 and the current transmission rate fluctuation type inter-device lines 11 and 12 held in the inter-device line termination units 109 and 110, respectively. Based on the transmission rate information, the TDM line that can be transmitted is monitored. Due to fluctuations in the transmission rate, the data of the TDM line terminated in the line relay device is changed to the transmission rate fluctuation type inter-device line of the inter-device line termination unit to which the TDM line is currently mapped, for example, the inter-device line termination unit 109.
- the transmission rate variation type inter-device line 12 of the other inter-device line termination unit for example, the inter-device line termination unit 110 is used as a bypass path.
- a mapping request requesting that the data on the TDM line be bypassed is transmitted to the opposite apparatus connected to the line 12 between the transmission speed fluctuation type apparatuses, for example, the line relay apparatus 2.
- the mapping request source counterpart apparatus for example, the line relay apparatus 1
- a mapping permission notification indicating that mapping as a detour route is possible is performed, and at the same time, a mapping request is sent to the other opposite device, for example, the line relay device 3, as a final detour route setting destination as a final destination. I do.
- mapping request source device for example, the line relay device 1 is mapped. It is made to recognize that mapping is impossible by notifying that it is impossible or not performing an operation of notifying mapping permission.
- the device specific information storage unit 103 can uniquely distinguish each of the line relay devices 2 and 3 configuring the network including the own line relay device 1 from other devices.
- Device-specific information such as a MAC address is stored.
- the line relay apparatus that becomes the final destination, for example, the line relay
- the device unique information for uniquely identifying the device 3, such as a MAC address is extracted from the device unique information storage unit 103, attached to the mapping request, and transmitted to the line relay device 2 of the opposite device.
- the device-specific information storage unit 103 indicates whether or not the destination attached to the mapping request (information indicating the circuit relay device as the final transmission destination) is the own device. This is determined with reference to the device-specific information stored in the device.
- each of the line relay device 1, the line relay device 2, and the line relay device 3 shown in FIG. 4 has the same block configuration as the line relay device 1 shown in FIG. An interface that accommodates the intermediate line, the TDM line, and the Ethernet line is provided.
- the line relay device 1, the line relay device 2, and the line relay device 3 respectively include transmission speed fluctuation type inter-apparatus lines 11, 12, transmission speed fluctuation type inter-apparatus lines 12, 13, and transmission speed fluctuation type inter-apparatus line 13, 11, two transmission rate variation type inter-device lines are accommodated, and the transmission rate variation type inter-device lines 11, 12, 13 form a Ring configuration.
- the line relay device 1 is connected to the TDM termination device 21 via a TDM line, and the line relay device 3 is also connected to the TDM termination device 22 via a TDM line.
- the line relay device 1 and the line relay device 3 are connected by a transmission rate fluctuation type inter-device line 11, and TDM communication is performed between the TDM termination device 21 and the TDM termination device 22.
- each of the line relay device 1, the line relay device 2, and the line relay device 3 is connected to the L2 switches 31, 32, and 33 by an Ethernet line, and performs Ethernet communication.
- the transmission rate variation type is used in the normal Ethernet communication.
- the inter-device line 13 is logically disconnected.
- the transmission speed variation type inter-device line 13 is connected as a physical line, and data transfer is possible for TDM communication other than Ethernet communication and other protocol communication.
- the transmission speed of the transmission speed fluctuation type inter-apparatus line 11 fluctuates, and the transmission band of the transmission speed fluctuation type inter-apparatus line 11 is accommodated between the TDM termination apparatus 21 and the line relay apparatus 1.
- the transmission band is reduced below the transmission band that can transmit all TDM lines, the inter-device line termination unit 109 of the line relay device 1 in FIG. Notification of the transmission speed fluctuation of the inter-line 11 and notification of new speed information after the fluctuation are performed.
- the mapping request processing unit 108 In response to the notification, the mapping request processing unit 108, based on the new transmission rate information after the change and the information in the mapping memory of the distribution mapping unit 107, transmits the current transmission on the transmission rate fluctuation type inter-device line 11 in FIG. It is determined whether the speed can transmit all the data of the accommodated TDM line.
- the mapping request processing unit 108 forms a detour path for the data of the TDM line corresponding to the overflowed band, so that the transmission rate fluctuation type inter-device line of FIG. 12 is a request for confirming whether or not a detour path can be formed through the transmission rate fluctuation type inter-device line 13, that is, a mapping request for requesting the formation of a detour path. Is transmitted with information indicating the bandwidth of the overflowing TDM line.
- the line relay apparatus 2 that has received the confirmation request, that is, the mapping request, has the same configuration as that of the line relay apparatus 1 in FIG.
- FIG. 2 is a block diagram showing a block configuration of the line relay device 2 in the network of FIG. 4, and similarly to the line relay device 1 of FIG. 1, a TDM line termination unit 201, an Ethernet line termination unit 202, and device-specific information storage.
- the inter-apparatus line termination units 209 and 210 are sections that respectively terminate the transmission speed fluctuation type inter-apparatus lines 12 and 13 that form a ring-shaped network.
- the inter-device line termination unit 209 transfers the confirmation request received from the line relay device 1, that is, the mapping request, to the mapping request processing unit 208, and the mapping request processing unit 208 performs the processing.
- the mapping request processing unit 208 is requested by a mapping request from the line relay device 1 based on the mapping memory information of the distribution mapping unit 207 and the transmission rate information of the transmission rate variation type inter-device line 13 serving as a detour path. It is determined whether or not it is possible to secure a transmission band for the TDM line that is being used.
- the mapping request processing unit 208 uses the mapping request in the transmission speed variable inter-device line 12 serving as a detour path.
- a similar mapping request (a request for confirming whether or not a detour path can be formed through the transmission rate fluctuation type inter-device line 13, that is, a mapping request for requesting the detour path formation) is transmitted to the previous line relay apparatus 3. .
- FIG. 3 is a block diagram showing a block configuration of the line relay device 3 in the network of FIG. 4.
- a TDM line termination unit 301 As with the line relay device 1 of FIG. 1, a TDM line termination unit 301, an Ethernet line termination unit 302, and device-specific information storage Unit 303, STP processing unit 304, MUX / DEMUX 305, inter-device line aggregation / distribution unit 306, distribution mapping unit 307, mapping request processing unit 308, and inter-device line termination units 309 and 310.
- the inter-apparatus line termination units 309 and 310 are sections that respectively terminate the transmission rate variable inter-apparatus lines 11 and 13 that form a ring-shaped network.
- the TDM line The data corresponding to the TDM transmission band reduced in the transmission speed variation type inter-device line 11 connecting between the line previously set as the data transfer route (TDM path), that is, between the line relay device 1 and the line relay device 3 is obtained.
- TDM path data transfer route
- FIG. 5 shows the transfer of TDM data before the transmission band of the transmission speed fluctuation type inter-apparatus line (transmission speed fluctuation type inter-apparatus line 11) previously set as the data transfer path of the TDM line in the network of FIG.
- FIG. 6 is an explanatory diagram for explaining a route to be transmitted, and the transmission rate fluctuation type inter-device line 11 has a transmission band that can transmit all 16 channels of the TDM line as a TDM path.
- the transfer path 41 is indicated by a bold line.
- FIG. 6 shows the TDM data after the transmission band of the transmission speed fluctuation type inter-apparatus line (transmission speed fluctuation type inter-apparatus line 11), which has been set in advance as the data transfer path of the TDM line in the network of FIG.
- FIG. 2 is an explanatory diagram for explaining a path through which transmission is performed, in which the transmission band of the transmission rate fluctuation type inter-device line 11 fluctuates, and the transmission previously set as the data transfer path 41 (TDM path) of the TDM line
- TDM path data transfer path 41
- the TDM data bypass transfer path 42 is used as the line relay apparatus 1, the transmission speed fluctuation type inter-apparatus line 12, the line relay apparatus 2, and the transmission speed fluctuation type apparatus.
- a detour path between the line 13 and the line relay apparatus 3 is formed, and the TDM data for 6 channels overflowing from the transfer path 41 is transmitted to the line relay apparatus 3 via the line relay apparatus 2.
- FIG. 7 is a flowchart for explaining the flow of operations on the side of the detour path request source apparatus (line relay apparatus 1) during detour control related to the TDM line in the network shown in FIG.
- the flow of the detour operation for detouring the data transfer path of the TDM line in the line relay device 1 will be described by taking as an example the case where the transmission band of the TDM line cannot be secured due to the decrease in the transmission band of the TDM line. Yes. That is, an example of the detour setting operation in the line relay apparatus 1 serving as a detour path request source apparatus for TDM line data is shown.
- the line relay apparatus 1 shows that the transmission speed of the transmission speed variation type inter-apparatus line 11 fluctuates at the inter-apparatus line termination unit 109 shown in FIG.
- the mapping request processing unit 108 is notified of this, and when the mapping request processing unit 108 first detects a change in the transmission rate of the transmission rate variation type inter-device line, it changes the distribution mapping. It is determined whether the function to be performed (mapping setting change flag) is valid (ON) or invalid (OFF) (step ST2).
- step ST2 If the function for changing the distribution mapping is disabled (NO in step ST2), the process proceeds to step ST9 without performing the mapping control setting changing process for changing the mapping for changing the transfer path ( Step ST9), the detour control process is terminated.
- step ST2 if the function of changing the distribution mapping is enabled (YES in step ST2), the process proceeds to step ST3, and the own line relay apparatus is referred to by referring to the mapping memory information of the distribution mapping unit 107 1 confirms the mapping state of the transmission rate fluctuation type inter-device lines 11 and 12 connected to 1 (step ST3).
- step ST4 it is confirmed whether or not mapping to 12 is possible. That is, it is confirmed whether or not the transmission bandwidth of the TDM line overflowing due to the transmission speed reduction of the transmission speed fluctuation type inter-apparatus line 11 can be bypassed to the transmission speed fluctuation type inter-apparatus line 12.
- step ST4 If it is determined that it is impossible to map the transmission band of the TDM line to the transmission speed fluctuation type inter-device line 12 (NO in step ST4), the process proceeds to step ST9 and the mapping control setting change process is performed. Without performing (step ST9), the detour control process is terminated.
- step ST4 the process proceeds to step ST5, where the transmission speed variable inter-apparatus line is transmitted. 12 overflowed from the transmission rate variable inter-device line 11 together with the destination information indicating the line relay device 3 that is the final transmission destination of the data of the TDM line with respect to the line relay device 2 of the opposite device connected to 12 A mapping request with information indicating the transmission band of the TDM line is transmitted via the transmission speed fluctuation type inter-apparatus line 12 (step ST5).
- mapping request In the line relay device 2 of the opposite device to which the mapping request is sent, processing relating to the mapping request from the line relay device 1 is performed, and it is determined whether or not the mapping request can be performed. If it is possible, the mapping permission information is returned to the mapping requesting line relay device 1 via the transmission speed variation type inter-device line 12.
- the mapping request source line relay device 1 determines whether or not the mapping permission information returned from the request destination opposite device line relay device 2 via the transmission speed variation type inter-device line 12 has been received ( Step ST6). If the mapping permission information returned from the line relay device 2 of the request destination opposite device has not been received yet (NO in step ST6), whether or not a predetermined timeout time has elapsed since the mapping request was transmitted It is determined whether or not a reception timeout of the mapping permission information has been reached (step ST8). The timeout time is arbitrarily determined according to the transmission speed and the installation environment.
- step ST8 If the time-out period has not yet been reached after the mapping request is transmitted and the reception time-out has not yet occurred (NO in step ST8), the process returns to step ST5, and the mapping request is again transmitted with the transmission rate fluctuation.
- step ST8 When the operation of transmitting to the line relay device 2 of the opposite device is repeated via the inter-type device line 12 and the time-out time elapses after the mapping request is transmitted, (YES in step ST8), it is assumed that the line relay device 2 is in a state where it is impossible to perform the mapping for the bypass route, and the process proceeds to step ST9 to execute the mapping control setting change process. Without performing (step ST9), the detour control process is terminated.
- step ST6 when the mapping permission information returned from the line relay device 2 of the opposite device as the request destination is received (YES in step ST6), both the line relay device 1 and the line relay device 2 Since mapping to the transmission speed fluctuation type inter-device line 12 corresponding to the transmission band of the TDM line overflowed by the transmission speed reduction of the transmission speed fluctuation type inter-device line 11 is possible, the information in the mapping memory of the distribution mapping unit 107 is changed. Then, the transmission bandwidth of the TDM line reduced in the transmission speed fluctuation type inter-apparatus line 11 is remapped to the transmission speed fluctuation type inter-apparatus line 12 (step ST7). As a result, as shown in FIG.
- the transmission bandwidth of the TDM line overflowing from the transmission speed fluctuation type inter-device line 11 set in advance as the data transfer path 41 of the TDM line is set as the bypass transfer path 42.
- the deferred transfer is made to the line relay apparatus 2 via the detour path of the transmission speed variation type inter-apparatus line 12.
- the mapping control to the transmission speed fluctuation type inter-apparatus line 12 corresponding to the transmission band of the TDM line overflowed by the reduction of the transmission band of the transmission speed fluctuation type inter-apparatus line 11 is performed.
- the transmission band of the transmission speed fluctuation type inter-apparatus line 11 is restored, and the transmission band of the TDM line is restored to a state where the transmission band of the transmission speed fluctuation type inter-apparatus line 11 can be mapped.
- FIG. 8 is a flowchart for explaining the operation flow on the side of the detour path request source apparatus (line relay apparatus 1) at the time of detour recovery control for the TDM line in the network shown in FIG.
- the data relay path of the TDM line in the line relay apparatus 1 Describes the flow when recovering from the normal transfer path. That is, an example of the detour recovery operation in the line relay apparatus 1 that has been the detour path request source apparatus of the data of the TDM line is shown.
- the line relay apparatus 1 shows that the transmission speed of the transmission speed fluctuation type inter-apparatus line 11 fluctuates at the inter-apparatus line termination unit 109 shown in FIG.
- the mapping request processing unit 108 is notified of this, and when the mapping request processing unit 108 first detects a change in the transmission rate of the transmission rate fluctuation type inter-device line, it changes the distribution mapping. It is determined whether the function to be performed (mapping setting change flag) is valid (ON) or invalid (OFF) (step ST12).
- step ST12 If the function of changing the distribution mapping is disabled (NO in step ST12), the process proceeds to step ST20 without performing the mapping control setting changing process for changing the mapping for changing the transfer path ( Step ST20), the detour control process is terminated.
- step ST12 if the function of changing the distribution mapping is enabled (YES in step ST12), the process proceeds to step ST13, and the own line relay apparatus is referred to by referring to the mapping memory information of the distribution mapping unit 107 1 confirms the mapping state of the transmission rate fluctuation type inter-device lines 11 and 12 connected to 1 (step ST13).
- the transmission speed of the transmission speed variation type inter-device line 11 is increased, so that the transmission bandwidth of the TDM line is changed. It is confirmed whether or not the transmission band of the TDM line mapped to the inter-line 12 can be re-mapped to the transmission speed variation type inter-apparatus line 11 (step ST14). That is, the transmission band of the TDM line that has been detoured to the transmission speed fluctuation type inter-apparatus line 12 due to the increase in the transmission speed of the transmission speed fluctuation type inter-apparatus line 11 is transferred back to the transmission speed fluctuation type inter-apparatus line 11. It is confirmed whether it is possible to make it possible.
- step ST14 When it is determined that it is impossible to map the transmission band of the TDM line that has been mapped to the transmission speed fluctuation type inter-apparatus line 12 until now (NO in step ST14) Then, the process proceeds to step ST20, and the bypass control process is terminated without performing the mapping control setting change process (step ST20).
- Transits to step ST15 changes the information in the mapping memory of the distribution mapping unit 107, restores the transmission bandwidth of the TDM line mapped to the transmission speed variable inter-device line 12 to the original state, Remap the transmission speed variation type inter-device line 11 (step ST15).
- step ST16 the data of the TDM line is transferred to the line relay apparatus 2 of the opposite apparatus connected to the transmission speed variation type inter-apparatus line 12 that has been set as the detour path of the TDM line until now.
- a mapping release request with information indicating the transmission band of the TDM line that has been detoured until now is sent to the transmission rate fluctuation type inter-device line 12.
- the processing related to the mapping cancellation request from the line relay device 1 is performed, and it is determined whether or not the mapping cancellation request can be performed. If it can be carried out, the mapping release permission information is returned to the line relay apparatus 1 that has issued the mapping release request via the transmission speed variation type inter-device line 12.
- the line relay device 1 that is the source of the mapping cancellation request determines whether or not the mapping cancellation permission information that is returned from the line relay device 2 of the opposite device that is the request destination is returned via the transmission speed variable inter-device line 12. It performs (step ST17). If the mapping release permission information returned from the line relay device 2 of the opposite device as the request destination has not been received yet (NO in step ST17), a predetermined time-out period has elapsed since the mapping release request was transmitted. It is determined whether or not a reception timeout of the mapping release permission information has been reached (step ST19). The timeout time is arbitrarily determined according to the transmission speed and the installation environment.
- step ST19 If the time-out period has not been reached yet after the transmission of the mapping release request and the reception time-out has not occurred (NO in step ST19), the process returns to step ST16, and the mapping release request is transmitted again.
- the operation of transmitting to the line relay apparatus 2 of the opposite apparatus is repeated through the speed-variable apparatus-to-apparatus line 12, and in response to this, the time-out period elapses after the mapping release request is transmitted, and the reception time-out occurs. If this happens (YES in step ST19), it is considered that the mapping state set for the detour route by the line relay device 2 cannot be released, and the process proceeds to step ST20.
- the bypass control process is terminated without executing the mapping control setting change process (step ST20). In such a case, the state of the mapping memory of the distribution mapping unit 107 is restored to the state when the detour path is set, and the detour control to the line repeater 2 is continued to be performed in the line repeater 1 as well. Also good.
- step ST17 when the mapping release permission information returned from the line relay device 2 of the opposite device as the request destination is received (YES in step ST17), both the line relay device 1 and the line relay device 2 Thus, it is possible to cancel each other's mapping with respect to the detour transfer path that has been detoured until now, and it is mapped to the transmission speed variation type inter-device line 12 by the increase in the transmission rate of the transmission rate variation type inter-device line 11 until now. In this state, it is possible to restore the original state in which the mapping to the transmission speed fluctuation type inter-device line 11 corresponding to the transmission band of the TDM line that has been performed can be performed.
- the information in the mapping memory of the distribution mapping unit 107 is changed so that the mapping state before the detour path is formed, that is, the original mapping state before the transmission speed of the transmission speed variation type inter-device line 11 is reduced is restored. Then, the transmission bandwidth of the TDM line that has been detoured to the transmission speed fluctuation type inter-apparatus line 12 is remapped to the transmission speed fluctuation type inter-apparatus line 11 (step ST18).
- the setting of the detour transfer path 42 of the TDM line as shown in FIG. 6 is canceled, and the transmission speed shown in FIG. 5 set in advance as the transfer path of the TDM line.
- the state is restored to the state of transferring the data of the TDM line only through the transfer path 41 of the variable inter-device line 11.
- the mapping control to the transmission speed fluctuation type inter-device line 12 corresponding to the transmission band of the TDM line overflowed by the reduction of the transmission band of the transmission speed fluctuation type inter-device line 11 is performed.
- the detour path setting on the line relay apparatus 2 side of the opposite apparatus is set.
- FIG. 9 is a flowchart for explaining the operation flow on the side of the detour path request destination apparatus (line relay apparatus 2) at the time of detour control related to the TDM line in the network shown in FIG.
- the data of the TDM line is received by the line relay apparatus 2 of the opposite apparatus that has received the mapping request from the line relay apparatus 1.
- the flow at the time of forming the detour route of is described. That is, the line relay device 2 that receives a mapping request from the line relay device 1 as a detour destination candidate of the data of the TDM line accommodated in the line relay device 1 (the data of the TDM line data accommodated in the line relay device 1).
- An example of the detour setting operation in the line relay apparatus 3 that is, the line relay apparatus of the mapping request transmission destination other than the detour path request final destination apparatus in which the TDM line as the final transmission destination is accommodated is shown.
- the line relay apparatus 2 has received the mapping request from the line relay apparatus 1 via the transmission rate fluctuation type inter-apparatus line 12 in the inter-apparatus line termination unit 209 shown in FIG. It is determined whether or not it has been detected (step ST21). When the reception of the mapping request from the line relay device 1 is not detected (NO in step ST21), the process proceeds to step ST34, and the mapping control setting changing process for changing the mapping for changing the transfer path is performed. Without (step ST34), the detour control process is terminated.
- mapping request processing unit 208 when it is detected that the mapping request from the line relay device 1 has been received (YES in step ST21), the mapping request processing unit 208 is notified of this, and the mapping request processing unit 208 first transmits the transmission rate.
- the mapping request processing unit 208 When a change in the transmission speed of the line between the variable type devices is detected, it is determined whether the function for changing the distribution mapping (mapping setting change flag) is enabled (ON) or disabled (OFF) ( Step ST22).
- step ST34 If the function for changing the distribution mapping is disabled (NO in step ST22), the process proceeds to step ST34, and the bypass control process is terminated without performing the mapping control setting change process (step ST34). .
- step ST22 if the function of changing the distribution mapping is enabled (YES in step ST22), the process proceeds to step ST23, and the device specific information of the own device stored in the device specific information storage unit 203 is displayed. Referring to it, it is confirmed whether or not the destination as the final transmission destination attached to the received mapping request from the line relay apparatus 1 is the line relay apparatus 2 of the own apparatus (step ST23).
- step ST31 the information of the mapping memory of the distribution mapping unit 207 is referred to.
- the mapping state of the transmission speed fluctuation type inter-apparatus line 12 connected to the line relay apparatus 2 is confirmed, and the transmission band of the TDM line attached to the received mapping request is transferred to the transmission speed fluctuation type inter-apparatus line 12.
- the information in the mapping memory of the distribution mapping unit 207 is changed so as to remap to the secured state (step ST31). Thereafter, mapping permission information indicating that the requested mapping has been implemented is returned to the mapping request source line relay apparatus 1 via the transmission speed fluctuation type inter-apparatus line 12 (step ST32), and detour control is performed. Terminate the process.
- the mapping request processing unit 208 of the line relay device 2 uses the transmission rate variation type inter-device line connected to the other inter-device line termination unit 210.
- the process is terminated without performing any process related to the detour control.
- the information regarding the destination attached to the mapping request as long as it is information that allows each line relay device to uniquely distinguish between its own device and other devices when the network is configured as described above.
- a MAC address may be used.
- step ST23 When it is determined in step ST23 that the destination of the received mapping request from the line relay device 1 is not the own device (NO in step ST23), the process proceeds to step ST24 and the mapping memory of the distribution mapping unit 207 With reference to the information, the mapping state of the other transmission rate fluctuation type inter-device line 13 connected to the own-line relay device 2 is confirmed (step ST24).
- step ST25 it is confirmed whether or not mapping to the line 13 is possible (step ST25). That is, it is possible to bypass the transmission bandwidth of the TDM line overflowing due to the decrease in the transmission speed of the transmission speed fluctuation type inter-apparatus line 11 to the transmission speed fluctuation type inter-apparatus line 13 via the transmission speed fluctuation type inter-apparatus line 12. It is confirmed whether or not.
- step ST25 If it is determined that it is impossible to map the transmission band of the TDM line requested by the mapping request from the line relay apparatus 1 to the transmission speed variation type inter-apparatus line 13 (NO in step ST25), step The process proceeds to ST34, and the bypass control process is terminated without performing the mapping control setting change process (step ST34).
- step ST25 if it is determined that the transmission band of the TDM line can be mapped to the transmission speed fluctuation type inter-device line 13 (YES in step ST25), the process transits to step ST26, and the circuit is relayed as a bypass route.
- Transmission rate variation type inter-device line corresponding to the transmission bandwidth of the TDM line requested by the mapping request from the device 1, that is, the transmission bandwidth of the TDM line overflowed by the transmission rate reduction of the transmission rate variation type inter-device line 11 12 can be mapped, the information in the mapping memory of the distribution mapping unit 107 is changed, and the transmission bandwidth of the TDM line requested by the mapping request from the line relay apparatus 1 is changed to the transmission rate fluctuation type inter-apparatus line. 12 is re-mapped (step ST26).
- mapping permission information indicating that the requested mapping has been performed is returned to the line relay apparatus 1 which is the transmission source of the mapping request via the transmission speed variable inter-apparatus line 12 (step ST27). .
- a detour route from the line relay device 1 to the line relay device 2 is formed in the detour transfer route 42 shown in FIG.
- mapping request processing unit 208 of the line relay device 2 sends a mapping request from the line relay device 1 to the line relay device 3 designated as the final transmission destination of the mapping request from the line relay device 1.
- a mapping request with information indicating the transmission band of the attached TDM line (that is, the transmission band of the TDM line overflowing from the transmission speed fluctuation type inter-apparatus line 11) is sent via the transmission speed fluctuation type inter-apparatus line 13. (Step ST28).
- mapping request from the line relay device 2 can be executed by performing processing related to the mapping request from the line relay device 2 in the line relay device 3 of the opposite device to which the mapping request from the line relay device 2 is transmitted. If it is determined and can be implemented, the mapping permission information is returned to the mapping requesting line relay device 2 via the transmission rate fluctuation type inter-device line 13.
- the mapping request source line relay apparatus 2 determines whether or not the mapping permission information returned from the request destination opposite apparatus line relay apparatus 3 via the transmission speed variation type inter-device line 13 is received ( Step ST29). If the mapping permission information returned from the line relay device 3 of the request destination opposite device has not been received yet (NO in step ST29), whether or not a predetermined timeout period has elapsed since the mapping request was transmitted It is determined whether or not a mapping timeout information reception timeout has occurred (step ST33). The timeout time is arbitrarily determined according to the transmission speed and the installation environment.
- step ST33 If the time-out period has not yet been reached after the mapping request is transmitted and the reception time-out has not occurred (NO in step ST33), the process returns to step ST28, and the mapping request is again transmitted with the transmission rate fluctuation.
- the transmission operation to the line relay device 3 of the opposite device is repeated through the inter-type device line 13 and a timeout occurs after the mapping request is transmitted until the timeout time is reached. (YES in step ST33), it is considered that the line relay device 3 is in a state where it is impossible to perform the mapping for the bypass route, and the process proceeds to step ST34 to execute the mapping control setting change process. Without performing (step ST34), the detour control process is terminated.
- the state of the mapping memory of the distribution mapping unit 207 is restored to the state before the change processing in step ST26, and the line relay device 2 is set to a state in which the detour control cannot be performed.
- the device 1 may be notified that the detour control has become impossible.
- step ST29 when the mapping permission information returned from the line relay device 3 of the opposite device as the request destination is received (YES in step ST29), both the line relay device 2 and the line relay device 3 Mapping of the transmission bandwidth of the TDM line requested by the mapping request (that is, the transmission bandwidth of the TDM line overflowed by the transmission speed reduction of the transmission speed fluctuation type inter-device line 11) to the transmission speed fluctuation type inter-device line 13 is performed.
- the information in the mapping memory of the distribution mapping unit 207 is changed, and the transmission bandwidth of the TDM line requested by the mapping request (that is, the TDM line overflowed due to the transmission speed reduction of the transmission speed fluctuation type inter-device line 11) Are re-mapped to the transmission speed fluctuation type inter-device line 13 (steps). ST30).
- the transmission bandwidth of the TDM line overflowing from the transmission speed fluctuation type inter-device line 11 set in advance as the data transfer path 41 of the TDM line is set as the bypass transfer path 42.
- detour transfer is performed to the line relay apparatus 3 via the detour path of the transmission speed fluctuation type inter-apparatus line 12, the line relay apparatus 2, and the transmission speed fluctuation type inter-apparatus line 13.
- the transmission bandwidth of the TDM line requested by the mapping request from the line relay apparatus 1 (that is, the TDM line overflowed by the reduction of the transmission band of the transmission speed variable inter-apparatus line 11).
- the transmission bandwidth of the transmission speed fluctuation type inter-device line 11 is restored from the state where the mapping control to the transmission speed fluctuation type inter-device lines 12 and 13 is carried out, and the entire transmission band of the TDM line is transmitted.
- the bandwidth is restored when a mapping release request indicating that the setting of the detour path is released is received from the line relay device 1 because the mapping to the transmission band of the speed fluctuation type inter-device line 11 is restored.
- FIG. 10 is a flowchart for explaining the flow of operations on the side of the detour path request destination apparatus (line relay apparatus 2) at the time of detour recovery control related to the TDM line in the network shown in FIG.
- line relay apparatus 2 line relay apparatus 2
- an unmapping request from the line relay apparatus 1 is received.
- the flow when the circuit relay device 2 cancels the setting of the detour path of the data of the TDM line and restores to the normal state is described. That is, an example of the detour recovery operation in the line relay apparatus 2 that has been the detour path request destination apparatus of the data of the TDM line is shown.
- the line relay apparatus 2 has received a mapping release request from the line relay apparatus 1 via the transmission speed variation type inter-apparatus line 12 at the inter-apparatus line termination unit 209 shown in FIG. 2. Is detected (step ST41).
- the process proceeds to step ST50, and the mapping control setting changing process for changing the mapping for changing the transfer route is performed. Without doing so (step ST50), the detour control process is terminated.
- mapping request processing unit 208 when it is detected that the mapping cancellation request from the line relay device 1 has been received (YES in step ST41), the mapping request processing unit 208 is notified of this, and the mapping request processing unit 208 first transmits the data.
- the function for changing the distribution mapping (mapping setting change flag) is enabled (ON) or disabled (OFF).
- step ST42 If the function of changing the distribution mapping is disabled (NO in step ST42), the process proceeds to step ST50, and the bypass control process is terminated without performing the mapping control setting changing process (step ST50). .
- step ST42 when the function for changing the distribution mapping is enabled (YES in step ST42), the process proceeds to step ST43, and the information of the mapping memory of the distribution mapping unit 207 is changed to set the detour route. Is re-mapped so that the transmission band of the TDM line mapped to the transmission speed fluctuation type inter-device line 12 is restored to the original state (step ST43).
- mapping cancellation permission information indicating that the requested mapping cancellation has been performed is returned to the line relay device 1 that has transmitted the mapping cancellation request via the transmission rate fluctuation type inter-device line 12. (Step ST44). As a result, of the detour transfer path 42 shown in FIG. 6, the detour path from the line relay device 1 to the line relay device 2 is released.
- mapping request processing unit 208 of the line relay device 2 refers to the device specific information stored in the device specific information storage unit 203 and is attached to the received mapping cancellation request from the line relay device 1. It is confirmed whether or not the destination as the final transmission destination is the line relay device 2 of its own device (step ST45).
- the destination of the mapping cancellation request from the received line relay apparatus 1 is the own apparatus (YES in step ST45)
- the destination indicating the final transmission destination of the mapping cancellation request from the line relay apparatus 1 is the own apparatus.
- the line relay apparatus 2 is configured to send a mapping release request from the line relay apparatus 1 to the transmission speed variation type inter-apparatus line 13 connected to the other inter-apparatus line termination unit 210 (the line repeater 3 as the opposite apparatus). Since there is no need for further transfer to the connected line), the detour control processing is terminated.
- the information regarding the destination attached to the mapping request as long as it is information that allows each line relay device to uniquely distinguish between its own device and other devices when the network is configured as described above. There is no particular limitation, and for example, a MAC address may be used.
- the mapping request processing unit 208 of the line relay device 2 receives the request from the line relay device 1.
- the transmission bandwidth of the TDM line attached to the mapping cancellation request from the line relay device 1 that is, the transmission speed variation type device
- a mapping release request with information indicating the transmission bandwidth of the TDM line overflowing from the interline line 11 is transmitted via the transmission speed fluctuation type inter-apparatus line 13 (step ST46).
- mapping release permission information is returned to the line relay apparatus 2 that has made the mapping release request via the transmission rate fluctuation type inter-device line 13.
- the line relay apparatus 2 determines whether or not the mapping cancellation permission information returned from the line relay apparatus 3 of the request destination opposite apparatus via the transmission speed variation type inter-device line 13 has been received. Perform (step ST47). If the mapping release permission information returned from the line relay device 3 of the opposite device of the request destination has not been received yet (NO in step ST47), a predetermined time-out period has elapsed since the mapping release request was transmitted. It is determined whether or not a reception timeout of the mapping release permission information has been reached (step ST49). The timeout time is arbitrarily determined according to the transmission speed and the installation environment.
- step ST49 If the time-out period has not yet been reached since the mapping release request is transmitted and the reception time-out has not occurred (NO in step ST49), the process returns to step ST46, and the mapping release request is transmitted again.
- the operation of transmitting to the line relay device 3 of the opposite device is repeated via the speed variable type inter-device line 13, and in response to this, the time-out period elapses after the mapping release request is transmitted, and the reception time-out occurs. If it becomes (YES in step ST49), it is considered that the mapping state set for the detour route by the line relay device 3 cannot be released, and the process proceeds to step ST50. Thus, the bypass control process is terminated without executing the mapping control setting change process (step ST50).
- the mapping memory state of the distribution mapping unit 207 is restored to the state at the time of setting the detour route, and a notification is sent to the line relay device 1 not to cancel the detour route setting.
- detour control from the line relay device 1 to the line relay device 3 may be continued.
- step ST47 when the mapping release permission information returned from the line relay device 3 of the opposite device as the request destination is received (YES in step ST47), both the line relay device 2 and the line relay device 3 The TDM lines that have been mapped to the transmission rate variable inter-device line 13 until now in response to the mapping request from the line relay device 1 in a state in which the mutual mapping of the detour transfer route that has been detoured until now can be canceled In this state, it is possible to restore the original state in which the mapping to the transmission speed variation type inter-device line 11 corresponding to the transmission band of 1 is possible.
- the information in the mapping memory of the distribution mapping unit 207 is changed, the setting of the detour path for the transmission band of the TDM line specified by the mapping request from the line relay device 1 is canceled, and the transmission rate variation type device Mapping is performed again so that the transmission band of the TDM line mapped to the interline line 13 is restored to the original state (step ST48).
- the setting of the detour transfer path 42 of the TDM line as shown in FIG. 6 in the line relay apparatus 2 is completely canceled, and the original state is restored.
- mapping control to the transmission speed fluctuation type inter-apparatus line 12 corresponding to the transmission band of the TDM line overflowed by the reduction of the transmission band of the transmission speed fluctuation type inter-apparatus line 11 is performed.
- the mapping request has been transmitted from the line relay apparatus 2 to the line relay apparatus 3 designated as the destination as the final transmission destination of the mapping request transmitted from the line relay apparatus 1.
- An example of the flow of the detour route setting operation on the final destination line relay device 3 side will be described in detail with reference to the flowchart of FIG.
- FIG. 11 is a flowchart for explaining the flow of operations on the side of the detour route request final destination device (line relay device 3) at the time of detour control related to the TDM line in the network shown in FIG.
- line relay device 3 that has received the mapping request from the line relay apparatus 1 via the line relay apparatus 2 Describes the flow of forming a detour path for data on the TDM line.
- the detour setting operation in the line relay device 3 that is, the detour route request final destination device indicated by the destination attached as the final transmission destination to the mapping request from the line relay device 1 is shown.
- the line relay device 1 As shown in FIG. 9, it is accommodated in the line relay device 1 via the line relay device 2 that is the detour destination of the data of the TDM line accommodated in the line relay device 1.
- a mapping request to which the destination of the line relay apparatus 3 is attached is transmitted to the line relay apparatus 3 that accommodates the TDM line that is the final transmission destination of the data of the TDM line.
- the line relay apparatus 3 has received a mapping request from the line relay apparatus 2 via the transmission rate fluctuation type inter-apparatus line 13 in the inter-apparatus line termination unit 310 shown in FIG. It is determined whether or not it has been detected (step ST61). When the reception of the mapping request from the line relay device 2 is not detected (NO in step ST61), the process proceeds to step ST74, and the mapping control setting changing process for changing the mapping for changing the transfer path is performed. (Step ST74), the detour control process is terminated.
- mapping request processing unit 308 when it is detected that the mapping request from the line relay device 2 has been received (YES in step ST61), the mapping request processing unit 308 is notified of this, and the mapping request processing unit 308 first transmits the transmission rate.
- the mapping request processing unit 308 When a change in the transmission speed of the line between the variable type devices is detected, it is determined whether the function for changing the distribution mapping (mapping setting change flag) is enabled (ON) or disabled (OFF) ( Step ST62).
- step ST62 If the function of changing the distribution mapping is disabled (NO in step ST62), the process proceeds to step ST74, and the bypass control process is terminated without performing the mapping control setting change process (step ST74). .
- step ST62 if the function of changing the distribution mapping is enabled (YES in step ST62), the process proceeds to step ST63, and the device unique information of the own device stored in the device unique information storage unit 303 is displayed. Referring to it, it is confirmed whether or not the destination as the final transmission destination attached to the mapping request from the received line relay apparatus 2 is the line relay apparatus 3 of the own apparatus (step ST63).
- step ST63 If the destination of the mapping request from the received line relay apparatus 2 is the own apparatus (YES in step ST63), the process proceeds to step ST71, and the information of the mapping memory of the distribution mapping unit 307 is referred to.
- the mapping state of the transmission speed fluctuation type inter-apparatus line 13 connected to the line relay apparatus 3 is confirmed, and the transmission bandwidth of the TDM line attached to the received mapping request is transferred to the transmission speed fluctuation type inter-apparatus line 13.
- the information in the mapping memory of the distribution mapping unit 307 is changed so as to remap to the secured state (step ST71).
- mapping permission information indicating that the requested mapping has been implemented is returned to the mapping request source line relay apparatus 2 via the transmission speed variation type inter-apparatus line 13 (step ST72). Terminate the process.
- the detour transfer path 42 shown in FIG. 6 a detour path from the remaining line relay device 2 to the line relay device 3 is formed.
- the mapping request processing unit 308 of the line relay device 3 transmits the transmission rate fluctuation type inter-device line connected to the other inter-device line termination unit 309. 11 (the line to which the line relay apparatus 1 is connected as the opposite apparatus) is terminated without performing any process related to the detour control.
- the reason is that since the destination indicating the final transmission destination of the mapping request from the line relay device 2 is the own line relay device 3, it is not necessary to further transfer the mapping request from the line relay device 2. It is.
- the information regarding the destination attached to the mapping request as long as it is information that allows each line relay device to uniquely distinguish between its own device and other devices when the network is configured as described above. There is no particular limitation, and for example, a MAC address may be used.
- step ST63 If it is determined in step ST63 that the destination of the received mapping request from the line relay device 2 is not the own device (NO in step ST63), the process proceeds to step ST64 and the mapping memory of the distribution mapping unit 307 Referring to this information, it is confirmed what the mapping state of the other transmission rate variation type inter-device line 11 connected to the own-line relay device 3 is (step ST64).
- the line relay device 1 detects a decrease in the transmission rate of the transmission rate fluctuation type inter-device line 11 and transfers the data of the TDM line transferred to the transmission rate fluctuation type inter-device line 11. In order to set a detour route, a mapping request with the final transmission destination as the line relay device 3 is transmitted.
- step ST63 the destination of the received mapping request from the line relay device 2 is There is no case where it is determined that the destination of the mapping request from the received line relay device 2 is not the own device (NO in step ST53).
- the reception is performed here.
- a case where there is a case where it is determined that the destination of the mapping request from the line relay device 2 is not the own device (NO in step ST53) will be described below. That is, the case where the final destination of the mapping request from the line relay device 2 is not the line relay device 3 but the line relay device 1 will be described below.
- step ST65 it is confirmed whether or not mapping to the line 11 is possible (step ST65). That is, it is confirmed whether or not the transmission bandwidth of the TDM line specified by the mapping request from the line relay apparatus 2 can be further detoured to the transmission speed fluctuation type inter-apparatus line 11.
- step ST65 If it is determined that it is impossible to map the transmission band of the TDM line requested by the mapping request from the line relay apparatus 2 to the transmission speed variation type inter-apparatus line 11 (NO in step ST65), step The process proceeds to ST74, and the bypass control process is terminated without performing the mapping control setting change process (step ST74).
- step ST65 when it is determined that the transmission band of the TDM line can be mapped to the transmission speed variable inter-device line 11 (YES in step ST65), the process transits to step ST66, and the line relay is performed as a bypass route. Since mapping to the transmission speed variation type inter-device line 11 corresponding to the transmission bandwidth of the TDM line requested by the mapping request from the device 2 is possible, the information in the mapping memory of the distribution mapping unit 307 is changed, and the line relay is performed. The transmission bandwidth of the TDM line requested by the mapping request from the apparatus 2 is re-mapped to the transmission speed fluctuation type inter-apparatus line 11 (step ST66).
- mapping permission information indicating that the requested mapping has been implemented is returned to the line relay apparatus 2 that is the transmission source of the mapping request via the transmission rate fluctuation type inter-apparatus line 13 (step ST67). .
- a detour route from the line relay device 2 to the line relay device 3 is formed as a detour transfer route.
- mapping request processing unit 308 of the line relay device 3 sends a mapping request from the line relay device 2 to the line relay device 1 designated as the final transmission destination of the mapping request from the line relay device 2.
- a mapping request with information indicating the transmission band of the attached TDM line is transmitted via the transmission speed fluctuation type inter-device line 11 (step ST68).
- mapping request from the line relay device 3 can be executed by performing processing related to the mapping request from the line relay device 3 in the line relay device 1 of the opposite device to which the mapping request from the line relay device 3 is transmitted. If it is determined and can be carried out, the mapping permission information is returned to the mapping request source line relay apparatus 3 via the transmission speed fluctuation type inter-apparatus line 11.
- the mapping request source line relay device 3 determines whether or not the mapping permission information returned from the request destination opposite device line relay device 1 via the transmission speed variation type inter-device line 11 is received ( Step ST69). If the mapping permission information returned from the line relay device 1 of the opposite device as the request destination has not been received yet (NO in step ST69), whether or not a predetermined timeout time has elapsed since the mapping request was transmitted It is determined whether or not the mapping permission information reception timeout has been reached (step ST73). The timeout time is arbitrarily determined according to the transmission speed and the installation environment.
- step ST73 If the time-out period has not yet been reached after the mapping request is transmitted and the reception time-out has not occurred (NO in step ST73), the process returns to step ST68, and the mapping request is again transmitted with the transmission rate fluctuation.
- step ST73 When the operation of transmitting to the line relay device 1 of the opposite device is repeated through the inter-type device line 11 and the time-out time elapses after the mapping request is transmitted, (YES in step ST73), it is assumed that the line relay device 1 is in a state where it is impossible to perform the mapping for the detour route, and the process proceeds to step ST74 to execute the mapping control setting change process. Without performing (step ST74), the detour control process is terminated.
- the state of the mapping memory of the distribution mapping unit 307 is restored to the state before the change processing in step ST66, and the line relay device 3 is set to a state where the detour control cannot be performed.
- the device 2 may be notified that the detour control has become impossible.
- step ST69 when the mapping permission information returned from the line relay device 1 of the opposite device as the request destination is received (YES in step ST69), both the line relay device 3 and the line relay device 1 Since the mapping to the transmission speed variation type inter-device line 11 corresponding to the transmission band of the TDM line requested by the mapping request is possible, the information in the mapping memory of the distribution mapping unit 307 is changed and requested by the mapping request.
- the transmission bandwidth of the TDM line is re-mapped to the transmission speed fluctuation type inter-device line 11 (step ST70).
- step ST70 As a result, as a detour transfer path of data on the TDM line, a detour path of the transmission speed fluctuation type inter-apparatus line 13, the line relay apparatus 3, and the transmission speed fluctuation type inter-apparatus line 11 is formed.
- FIG. 12 is a flowchart for explaining the operation flow on the detour path request final destination apparatus (line relay apparatus 3) side during detour recovery control for the TDM line in the network shown in FIG.
- the mapping cancellation request from the line relay apparatus 1 is finally sent.
- 10 shows an example of a detour recovery operation in the line relay device 3 (ie, detour route request final destination device) indicated by a destination attached as a typical transmission destination.
- the detour recovery operation in the line relay device 3 that is, the detour route request final destination device indicated by the destination added as the final transmission destination to the mapping cancellation request from the line relay device 1 is shown.
- the line relay device 1 As shown in FIG. 10, it is accommodated in the line relay device 1 via the line relay device 2 that is the detour destination of the data of the TDM line accommodated in the line relay device 1.
- a mapping release request to which the destination of the line relay device 3 is attached is transmitted to the line relay device 3 that accommodates the TDM line that is the final transmission destination of the data of the TDM line.
- the line relay device 3 has received a mapping release request from the line relay device 2 via the transmission rate fluctuation type inter-device line 13 at the inter-device line termination unit 310 shown in FIG. 3. Is detected (step ST81).
- the process proceeds to step ST90, and the mapping control setting change process for changing the mapping for changing the transfer route is performed. Without doing so (step ST90), the detour control process is terminated.
- mapping request processing unit 308 when it is detected that the mapping cancellation request from the line relay apparatus 2 has been received (YES in step ST81), the mapping request processing unit 308 is notified of this, and the mapping request processing unit 308 first transmits the transmission.
- the function for changing the distribution mapping (mapping setting change flag) is enabled (ON) or disabled (OFF).
- step ST82 If the function of changing the distribution mapping is disabled (NO in step ST82), the process proceeds to step ST90, and the bypass control process is terminated without executing the mapping control setting change process (step ST90). .
- step ST82 when the function for changing the distribution mapping is enabled (YES in step ST82), the process proceeds to step ST43, and the information of the mapping memory of the distribution mapping unit 307 is changed to set the detour route. Is re-mapped so that the transmission band of the TDM line mapped to the transmission rate fluctuation type inter-device line 13 is restored to the original state (step ST83).
- mapping cancellation permission information indicating that the requested mapping cancellation has been performed is returned to the line relay device 2 that has transmitted the mapping cancellation request via the transmission rate fluctuation type inter-device line 13. (Step ST84).
- the detour transfer path 42 shown in FIG. 6 the detour path from the line relay device 2 to the line relay device 3 is released.
- mapping request processing unit 308 of the line relay device 3 refers to the device specific information stored in the device specific information storage unit 303 and is attached to the received mapping cancellation request from the line relay device 2. It is confirmed whether or not the destination as the final transmission destination is the line relay device 3 of the own device (step ST85).
- the destination of the mapping cancellation request from the received line relay apparatus 2 is the own apparatus (YES in step ST85)
- the destination indicating the final transmission destination of the mapping cancellation request from the line relay apparatus 2 is the own apparatus.
- the line relay apparatus 3 of FIG. 1 sends a mapping cancellation request from the line relay apparatus 2 to the transmission speed variable inter-apparatus line 11 connected to the other inter-apparatus line termination unit 309 (the line repeater 1 is used as the opposite apparatus). Since there is no need for further transfer to the connected line), the detour control processing is terminated.
- the information regarding the destination attached to the mapping request as long as it is information that allows each line relay device to uniquely distinguish between its own device and other devices when the network is configured as described above. There is no particular limitation, and for example, a MAC address may be used.
- the mapping request processing unit 308 of the line relay device 3 Mapping with information indicating the transmission band of the TDM line attached to the mapping release request from the line relay device 2 for the line relay device 1 designated as the final destination of the mapping release request of A cancellation request is transmitted via the transmission speed fluctuation type inter-device line 11 (step ST86).
- the line repeater 1 detects the recovery of the transmission speed of the transmission speed fluctuation type inter-apparatus line 11 where the transmission speed has been reduced, and transfers it to the transmission speed fluctuation type inter-apparatus line 11.
- the mapping cancel request with the final transmission destination as the line relay device 3 is transmitted.
- the destination of the mapping cancellation request from the received line relay apparatus 2 is determined to be the own apparatus, it is determined that the destination of the received mapping cancellation request from the line relay apparatus 2 is not the own apparatus. There is no case (NO in step ST85).
- the reception is performed here. A case will be described below where there is a case where it is determined that the destination of the mapping cancellation request from the line relay device 2 is not the own device (NO in step ST85). That is, the case where the final destination of the mapping cancellation request from the line relay device 2 is not the line relay device 3 but the line relay device 1 will be described below.
- the mapping release permission information is returned to the line relay apparatus 3 that has made the mapping release request via the transmission rate fluctuation type inter-device line 11.
- the line relay apparatus 3 determines whether or not it has received the mapping cancellation permission information returned from the line relay apparatus 1 of the opposite apparatus that is the request destination via the transmission speed variation type inter-device line 11. Perform (step ST87). If the mapping release permission information returned from the line relay device 1 of the opposite device of the request destination has not been received yet (NO in step ST87), a predetermined time-out period has elapsed after sending the mapping release request It is determined whether or not a reception timeout of the mapping release permission information has been reached (step ST89). The timeout time is arbitrarily determined according to the transmission speed and the installation environment.
- step ST89 If the time-out period has not been reached yet after the transmission of the mapping release request and the reception time-out has not occurred (NO in step ST89), the process returns to step ST86 and the mapping release request is transmitted again.
- the operation of transmitting to the line relay device 1 of the opposite device is repeated through the speed-variable inter-device line 11, and in response to this, the time-out period elapses after the mapping release request is transmitted, and the reception time-out occurs. If this happens (YES in step ST89), it is considered that the mapping state set for the detour route by the line relay device 1 cannot be released, and the process proceeds to step ST90. Thus, the bypass control process is terminated without executing the mapping control setting change process (step ST90).
- the mapping memory state of the distribution mapping unit 307 is restored to the state at the time of setting the bypass route, and a notification instructing the line relay device 2 not to cancel the setting of the bypass route is transmitted.
- detour control from the line relay device 2 to the line relay device 1 may be continuously performed.
- step ST87 when the mapping release permission information returned from the line relay device 1 of the opposite device of the request destination is received (YES in step ST87), both the line relay device 3 and the line relay device 1 The TDM lines that have been mapped to the transmission rate fluctuation type inter-device line 11 until now in response to the mapping request from the line relay device 2 in a state in which the mutual mapping of the detour transfer path that has been detoured until now can be canceled In this state, it is possible to restore to the original state in which mapping for the transmission band of 1 is possible.
- the information in the mapping memory of the distribution mapping unit 307 is changed, the setting of the detour path for the transmission band of the TDM line specified by the mapping request from the line relay device 2 is canceled, and the transmission rate variation type device Mapping is performed again so that the transmission band of the TDM line mapped to the interline line 11 is restored to the original state (step ST88).
- the setting of the detour transfer path of the TDM line in the line relay device 3 is completely canceled and the original state is restored.
- one of the line relay apparatuses 2 forms a detour path between the line relay apparatus 1 and the line relay apparatus 3 each accommodating a TDM line.
- the present invention is not limited to such a case, and any number of line relay apparatuses corresponding to the line relay apparatus 2 may be connected to the Ring network to form the Ring network. There is no limit to the number.
- each line relay device corresponding to the line relay device 2 operates as described above. By doing so, it is obvious that it is possible to form a detour route of the accommodated TDM line in the Ring network and to cancel the setting of the formed detour route without needing to explain again. It is.
- the network administrator automatically forms and cancels the detour route without taking action to change the network configuration according to the transmission speed fluctuation of the transmission speed fluctuation type inter-device line. It can be easily understood from the above detailed description that it is possible to realize a highly redundant network with respect to the TDM line.
- the first effect is that when the transmission band of the transmission speed fluctuation type inter-apparatus line connecting between the line relay apparatuses fluctuates, a detour path corresponding to the transmission band of the overflowing TDM line is automatically used by using the Ring configuration. Therefore, it is possible to reliably prevent data on the TDM line from being discarded and to provide a redundant service for the TDM transmission band.
- the second effect is that after automatically forming a detour path for the transmission band of the overflowing TDM line, following the change in the transmission band of the line between the transmission speed fluctuation type apparatuses connecting the line relay apparatuses.
- the transmission bandwidth of the transmission speed variation type device line returns to the original state, the data transfer path of the TDM line is automatically restored to the original state. It is not necessary to optimize the network settings every time the transmission speed of the interline line is changed.
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Abstract
Description
本発明は、かかる課題に鑑みてなされたものであり、Ring構成であることを利用して、伝送速度の変動に応じて、TDM回線の迂回経路を形成し、廃棄される可能性があったTDM回線のデータに対して冗長性のあるサービスを実現する回線中継装置、TDM回線迂回システムおよびTDM回線迂回制御方法を提供することを、その目的としている。
本発明の実施形態の説明に先立って、本発明の特徴についてその概要をまず説明する。本発明は、回線中継装置間を伝送速度が周辺環境等によって変動する伝送速度変動型装置間回線によってRing(リング)状に接続するRingネットワーク(リングネットワーク)において、該伝送速度変動型装置間回線の伝送速度が変動した際に、TDM(Time Division Multiplexing)回線のデータを迂回させる迂回経路を自動的に形成/解除する仕組みを提供するものであり、伝送速度変動型装置間回線の速度変動に追従して、TDM回線の伝送可能帯域が変動した場合に、ネットワーク設計者が意図した迂回経路を自動的に形成して、TDM回線に必要とする伝送帯域を確保する機能、および、形成されている迂回経路の設定を自動的に解除して、元の転送経路に復旧する機能を実現することを特徴としている。
次に、本発明による回線中継装置の構成例について、図1のブロック構成図を用いて説明する。図1は、本発明による回線中継装置のブロック構成の一例を示すブロック構成図であり、本発明においては、図4に示したRing状のネットワークを構成している回線中継装置1,2,3のいずれも、図1のような回線中継装置によって構成する場合を想定している。ここでは、図1の回線中継装置が図4の回線中継装置1として用いる場合を示し、回線中継装置2,3については、後述する図2、図3として示している。
次に、図1の回線中継装置1の接続構成について、その一例を、図4に示したRing構成のネットワークの場合を例にとってまず説明する。つまり、図4に示す回線中継装置1、回線中継装置2、回線中継装置3それぞれは、図1に示した回線中継装置1と同様のブロック構成によって構成されており、それぞれ、伝送速度変動型装置間回線とTDM回線、Ethernet回線とを収容するインタフェースを備えている。そして、回線中継装置1、回線中継装置2、回線中継装置3それぞれは、伝送速度変動型装置間回線11,12、伝送速度変動型装置間回線12,13、伝送速度変動型装置間回線13,11の2つずつの伝送速度変動型装置間回線を収容しており、伝送速度変動型装置間回線11,12,13によりRing構成を形成している。
以上に詳細に説明したように、本実施形態においては、次のような効果が得られる。
2 回線中継装置
3 回線中継装置
11 伝送速度変動型装置間回線
12 伝送速度変動型装置間回線
13 伝送速度変動型装置間回線
21 TDM終端装置
22 TDM終端装置
31 L2スイッチ
32 L2スイッチ
33 L2スイッチ
41 転送経路
42 迂回転送経路
101 TDM回線終端部
102 Ethernet回線終端部
103 装置固有情報保存部
104 STP処理部
105 MUX/DEMUX
106 装置間回線集約/分配部
107 振り分けマッピング部
108 マッピング要求処理部
109 装置間回線終端部
110 装置間回線終端部
201 TDM回線終端部
202 Ethernet回線終端部
203 装置固有情報保存部
204 STP処理部
205 MUX/DEMUX
206 装置間回線集約/分配部
207 振り分けマッピング部
208 マッピング要求処理部
209 装置間回線終端部
210 装置間回線終端部
301 TDM回線終端部
302 Ethernet回線終端部
303 装置固有情報保存部
304 STP処理部
305 MUX/DEMUX
306 装置間回線集約/分配部
307 振り分けマッピング部
308 マッピング要求処理部
309 装置間回線終端部
310 装置間回線終端部
Claims (9)
- 通信回線のデータを中継伝送する回線中継装置であって、対向装置との間を伝送速度が変動する伝送速度変動型装置間回線によってリング状に接続したリングネットワークを構成する回線中継装置において、TDM回線の転送経路としてあらかじめ設定されていた前記伝送速度変動型装置間回線の伝送速度が変動して、伝送可能な伝送帯域が減少したことを検知した際に、該伝送速度の変動幅に応じて、前記伝送速度変動型装置間回線から溢れた前記TDM回線の伝送帯域分を、リング状に接続された他の回線中継装置を経由して迂回転送させるTDM回線の迂回経路を形成することを特徴とする回線中継装置。
- 前記TDM回線の迂回経路を形成する際に、前記伝送速度変動型装置間回線から溢れた前記TDM回線の伝送帯域分を示す情報と前記TDM回線のデータの最終的な転送先となる回線中継装置を示す宛先とを付したマッピング要求を、リング状に接続された他の回線中継装置に送信することにより、他の中継装置から順次最終的な転送先となる回線中継装置まで、前記マッピング要求に付されている溢れた前記TDM回線の伝送帯域分をそれぞれの伝送速度変動型装置間回線にマッピングすることによって、最終的な転送先となる回線中継装置までの前記TDM回線の迂回経路を形成することを特徴とする請求項1に記載の回線中継装置。
- 前記TDM回線の転送経路としてあらかじめ設定されていた前記伝送速度変動型装置間回線の伝送速度が変動して、伝送可能な伝送帯域が元の状態に復したことを検知した際に、形成されていた前記TDM回線の迂回経路の設定を解除して、あらかじめ設定されていた前記TDM回線の転送経路を介して、前記TDM回線のデータを転送させる状態に復旧することを特徴とする請求項1または2に記載の回線中継装置。
- 形成されていた前記TDM回線の迂回経路の設定を解除する際に、前記伝送速度変動型装置間回線から溢れていた前記TDM回線の伝送帯域分を示す情報と前記TDM回線のデータの最終的な転送先となる回線中継装置を示す宛先とを付したマッピング解除要求を、リング状に接続された他の回線中継装置に送信することにより、他の中継装置から順次最終的な転送先となる回線中継装置まで、それぞれの伝送速度変動型装置間回線にマッピングされていた伝送帯域のうち、前記マッピング解除要求に付されている溢れた前記TDM回線の伝送帯域分を元の状態にマッピングし直すことによって、最終的な転送先となる回線中継装置までの前記迂回経路の設定を解除することを特徴とする請求項3に記載の回線中継装置。
- 通信回線のデータを中継伝送する回線中継装置間を伝送速度が変動する伝送速度変動型装置間回線によってリング状に接続した構成からなるリングネットワークを用いて、TDM回線の迂回経路を設定したり解除したりことを可能にするTDM回線迂回システムにおいて、各前記回線中継装置が、請求項1ないし4のいずれかの回線中継装置によって構成されていることを特徴とするTDM回線迂回システム。
- 通信回線のデータを中継伝送する回線中継装置間を伝送速度が変動する伝送速度変動型装置間回線によってリング状に接続した構成からなるリングネットワークを用いて、TDM回線の迂回経路を設定したり解除したりことを可能にするTDM回線迂回制御方法であって、各前記回線中継装置のいずれかが、TDM回線の転送経路としてあらかじめ設定されていた前記伝送速度変動型装置間回線の伝送速度が変動して、伝送可能な伝送帯域が減少したことを検知した際に、該伝送速度の変動幅に応じて、前記伝送速度変動型装置間回線から溢れた前記TDM回線の伝送帯域分を、リング状に接続された他の回線中継装置を経由して迂回転送させるTDM回線の迂回経路を形成することを特徴とするTDM回線迂回制御方法。
- 前記TDM回線の迂回経路を形成する際に、前記伝送速度変動型装置間回線から溢れた前記TDM回線の伝送帯域分を示す情報と前記TDM回線のデータの最終的な転送先となる回線中継装置を示す宛先とを付したマッピング要求を、リング状に接続された他の回線中継装置に送信することにより、他の中継装置から順次最終的な転送先となる回線中継装置まで、前記マッピング要求に付されている溢れた前記TDM回線の伝送帯域分をそれぞれの伝送速度変動型装置間回線にマッピングすることによって、最終的な転送先となる回線中継装置までの前記TDM回線の迂回経路を形成することを特徴とする請求項6に記載のTDM回線迂回制御方法。
- 前記TDM回線の転送経路としてあらかじめ設定されていた前記伝送速度変動型装置間回線の伝送速度が変動して、伝送可能な伝送帯域が元の状態に復したことを検知した際に、形成されていた前記TDM回線の迂回経路の設定を解除して、あらかじめ設定されていた前記TDM回線の転送経路を介して、前記TDM回線のデータを転送させる状態に復旧することを特徴とする請求項6または7に記載のTDM回線迂回制御方法。
- 形成されていた前記TDM回線の迂回経路の設定を解除する際に、前記伝送速度変動型装置間回線から溢れていた前記TDM回線の伝送帯域分を示す情報と前記TDM回線のデータの最終的な転送先となる回線中継装置を示す宛先とを付したマッピング解除要求を、リング状に接続された他の回線中継装置に送信することにより、他の中継装置から順次最終的な転送先となる回線中継装置まで、それぞれの伝送速度変動型装置間回線にマッピングされていた伝送帯域のうち、前記マッピング解除要求に付されている溢れた前記TDM回線の伝送帯域分を元の状態にマッピングし直すことによって、最終的な転送先となる回線中継装置までの前記迂回経路の設定を解除することを特徴とする請求項8に記載のTDM回線迂回制御方法。
Priority Applications (5)
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CN201280068904.7A CN104145436A (zh) | 2011-12-02 | 2012-09-27 | 线路中继设备、tdm线路迂回系统和tdm线路迂回控制方法 |
RU2014126857/08A RU2580440C2 (ru) | 2011-12-02 | 2012-09-27 | Линейное ретрансляционное устройство, система обходного пути tdm линии и способ управления обходным путем tdm линии |
US14/361,649 US9407553B2 (en) | 2011-12-02 | 2012-09-27 | Line relaying device, TDM line detour system, and TDM line detour control method |
EP12853661.2A EP2787689A4 (en) | 2011-12-02 | 2012-09-27 | LINE RELAY DEVICE, TDM LINE DETOUR SYSTEM, AND TDM LINE DETOUR CONTROL METHOD |
IL232872A IL232872A0 (en) | 2011-12-02 | 2014-05-29 | Wire relay device, tdm wire bypass system and tdm wire bypass control method |
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JP2011264713A JP2013118486A (ja) | 2011-12-02 | 2011-12-02 | 回線中継装置、tdm回線迂回システムおよびtdm回線迂回制御方法 |
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JP2003259471A (ja) | 2002-03-06 | 2003-09-12 | Hitachi Ltd | パケット/tdm統合型ノード装置 |
JP2003333057A (ja) * | 2002-05-14 | 2003-11-21 | Nec Corp | パケット通信経路制御方法およびパケット通信装置 |
JP2008172710A (ja) * | 2007-01-15 | 2008-07-24 | Fujitsu Ltd | 予備パス帯域の管理およびパス帯域の変更 |
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US6301254B1 (en) * | 1999-03-15 | 2001-10-09 | Tellabs Operations, Inc. | Virtual path ring protection method and apparatus |
US6940808B1 (en) * | 2000-04-13 | 2005-09-06 | Nortel Networks Limited | Adaptive rate traffic recovery mechanism for communication networks |
US7209436B1 (en) * | 2000-12-30 | 2007-04-24 | Redback Networks Inc. | Method and apparatus for variable rate pipes |
US6975589B2 (en) * | 2000-12-30 | 2005-12-13 | Redback Networks Inc. | Method and apparatus for a hybrid variable rate pipe |
US7724760B2 (en) * | 2001-07-05 | 2010-05-25 | Broadcom Corporation | Method and apparatus for bandwidth guarantee and overload protection in a network switch |
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CN104145436A (zh) | 2014-11-12 |
RU2014126857A (ru) | 2016-01-27 |
US9407553B2 (en) | 2016-08-02 |
IL232872A0 (en) | 2014-07-31 |
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